Abstract: The disclosure relates to a control circuit and a control method for a power converter. The power converter comprises a power switch and an inductor being coupled to the power switch. The control circuit controls operation of the power switch to charge and discharge the inductor for generating an inductor current and providing an output current. The control circuit controls the power switch to be turned on when or after an inductor current detection signal is zero, and controls the power switch to be turned off when the inductor current detection signal reaches a peak reference signal or when the power switch has been turned on for a maximum on time. The control circuit also adjusts the maximum on time in accordance with the inductor current detection signal, so that the power converter provides a constant output current to a load. The control circuit operates at a peak-value current mode and maintains the current of the power converter nearly stable without obtaining a compensation signal.

Abstract: The present disclosure relates to a supply voltage generating circuit and a switching power supply having the circuit. The supply voltage generating circuit provides a supply voltage for a power terminal of a control circuit in the switching power supply. The supply voltage generating circuit includes a switching circuit, a unidirectional conduction circuit and an energy storage circuit. In a time period during which a main power transistor is turned off, the switching circuit is turned off and a rectifying device provides a current to the energy storage circuit through the unidirectional conduction circuit, in a case that the supply voltage is smaller than a predetermined voltage reference; and the switching circuit is turned on and the current output from the rectifying device flows to the switching circuit, in a case that the supply voltage is larger than or equal to the predetermined voltage reference.

Abstract: An optical component comprising a mirror array having a multiplicity of mirror elements, which each have at least one degree of freedom of displacement, and which are each connected to at least one actuator for displacement, has a multiplicity of local regulating devices for damping oscillations of the mirror elements, wherein each of the regulating devices in each case has at least one capacitive sensor having at least one moveable electrode and at least one electrode arranged rigidly relative to the carrying structure.

Abstract: A mirror array having a total surface extending perpendicularly to a surface normal, comprises a multiplicity of mirror elements each having a reflection surface and at least one degree of freedom of displacement, wherein the totality of the mirror elements form a parqueting of a total reflection surface of the mirror array, and wherein the mirror array is embodied modularly as a tile element in such a way that the parqueting of the total reflection surface can be extended by a tiling of a plurality of such mirror arrays.

Abstract: A source driver circuit can include: (i) a control transistor having a control terminal and first and second power terminals, where the control transistor is coupled between a power terminal of a main switching transistor and ground; (ii) a power supply capacitor coupled between the control terminal of the main switching transistor and ground, where the power supply capacitor is configured to receive a bias voltage that is substantially constant; (iii) a freewheeling diode having a cathode coupled to a control terminal of the main switching transistor, and an anode coupled to the second power terminal of the main switching transistor; and (iv) the control transistor being controllable to be periodically turned on and off to control the main switching transistor to correspondingly follow on and off states of the control transistor.

Abstract: A dimming circuit for adjusting the brightness of an LED load, can include: a primary controlled flyback converter having a primary-side circuit, a first secondary-side circuit, and a second secondary-side circuit; a DC-DC converter coupled in a cascade arrangement with the second secondary-side circuit, where an output node of the DC-DC converter is coupled in series to an output node of the first secondary-side circuit; a control circuit configured to control, according to a dimming signal that represents an expected output current of the dimming circuit, a power switch of the primary controlled flyback converter to adjust output voltages of the first and second secondary-side circuits, to adjust a power that is provided to the LED load; and the control circuit being configured to control a power switch of the DC-DC converter according to the dimming signal, such that the DC-DC converter operates within a predetermined state range.

Abstract: The present disclosure relates to a supply voltage generating circuit and a switching power supply having the circuit. The supply voltage generating circuit provides a supply voltage for a power terminal of a control circuit in the switching power supply. The supply voltage generating circuit includes a switching circuit, a unidirectional conduction circuit and an energy storage circuit. In a time period during which a main power transistor is turned off, the switching circuit is turned off and a rectifying device provides a current to the energy storage circuit through the unidirectional conduction circuit, in a case that the supply voltage is smaller than a predetermined voltage reference; and the switching circuit is turned on and the current output from the rectifying device flows to the switching circuit, in a case that the supply voltage is larger than or equal to the predetermined voltage reference.

Abstract: A ripple suppression circuit configured to suppress a current ripple provided to a load by a DC converter, can include: a ripple voltage sampling circuit coupled to output terminals of the DC converter, where the ripple voltage sampling circuit is configured to generate a ripple reference voltage that represents a ripple voltage of an output voltage of the DC converter; and a voltage regulation circuit coupled to the load and the ripple voltage sampling circuit, where the voltage regulation circuit is controllable by the ripple reference voltage such that a voltage across the voltage regulation circuit is consistent with the ripple voltage.

Abstract: An EMI filter configured for an AC-DC switching power supply, and that is coupled between a DC-DC converter and a rectifier circuit that receives an AC power supply, can include: an input capacitor coupled in parallel to input terminals of the DC-DC converter; a transistor having a first terminal coupled to a first terminal of the input capacitor, and a second terminal coupled to ground; and a control circuit configured to generate a control signal that controls the transistor according to a feedback voltage that represents ripple information of an input voltage to the DC-DC converter, and at least one of a current that flows through the transistor, and a voltage at the first terminal of the transistor, where the control signal is used to regulate the voltage at the first terminal of the transistor to substantially eliminate switching frequency ripples from an input current of the DC-DC converter.

Abstract: The disclosure relates to a control circuit and a control method for a power converter. The power converter comprises a power switch and an inductor being coupled to the power switch. The control circuit controls operation of the power switch to charge and discharge the inductor for generating an inductor current and providing an output current. The control circuit controls the power switch to be turned on when or after an inductor current detection signal is zero, and controls the power switch to be turned off when the inductor current detection signal reaches a peak reference signal or when the power switch has been turned on for a maximum on time. The control circuit also adjusts the maximum on time in accordance with the inductor current detection signal, so that the power converter provides a constant output current to a load. The control circuit operates at a peak-value current mode and maintains the current of the power converter nearly stable without obtaining a compensation signal.

Abstract: In one embodiment, an AC-DC power converter can include: (i) a rectifier bridge and filter to convert an external AC voltage to a DC input voltage; (ii) a first energy storage element to store energy from the DC input voltage via a first current through a first conductive path when in a first operation mode; (iii) a second energy storage element configured to store energy from a second DC voltage via a second current through a second conductive path when in the first operation mode; (iv) a transistor configured to share the first and second conductive paths; (v) the first energy storage element releasing energy to a third energy storage element and a load through a third conductive path when in a second operation mode; and (vi) the second energy storage element releasing energy to the load through a fourth conductive path during the second operation mode.

Abstract: In one embodiment, a zero-crossing detection circuit can include: (i) a first detection circuit configured to detect a current through a main transistor of a main circuit of a switching power supply, and to generate a voltage sense signal that represents the current through the main transistor; (ii) a second detection circuit configured to detect if quasi-resonance occurs in the main circuit, the second detection circuit being configured to generate at least one pulse signal when the quasi-resonance is detected; and (iii) a control circuit configured to receive the at least one pulse signal and the voltage sense signal, to turn the main transistor off when the current through the main transistor reaches a predetermined value, and to turn the main transistor on when the at least one pulse signal is active.

Abstract: A method uses web servers to promulgate information from one server to another, instead of promulgating the information by the user to each server individually. A first server receives a first request for promulgating web-information from a user, locally promulgates the web-information, and sends a second request to at least one second website server to instruct the second website server to locally promulgate the web-information. The selection of the second server is done according to a preset configuration file which includes a relationship mapping between the first website server and the second website server. The relationship mapping may provide the user information related to the second website server based on the user information related to the first website server. The present disclosure further discloses a communication apparatus and a communication system.

Abstract: In one embodiment, an isolated power converter can include: (i) a transformer having a primary winding and a secondary winding; (ii) a secondary rectifier circuit coupled to the secondary winding; (iii) a power switch coupled between an input voltage source and a first terminal of the primary winding, where a second terminal of the primary winding is coupled to ground; (iv) a feedback circuit coupled between the first and second terminals of the primary winding, the feedback circuit being configured to generate a feedback voltage based on a voltage across the primary winding; (v) a control circuit configured to generate a control signal to control the power switch; and (vi) an over voltage protection circuit configured to activate a reset signal when the voltage feedback signal is greater than a threshold value, where the reset signal is configured to reset the control signal when activated.

Abstract: In one embodiment, a zero-crossing detection circuit can include: (i) a first detection circuit configured to detect a current through a main transistor of a main circuit of a switching power supply, and to generate a voltage sense signal that represents the current through the main transistor; (ii) a second detection circuit configured to detect if quasi-resonance occurs in the main circuit, the second detection circuit being configured to generate at least one pulse signal when the quasi-resonance is detected; and (iii) a control circuit configured to receive the at least one pulse signal and the voltage sense signal, to turn the main transistor off when the current through the main transistor reaches a predetermined value, and to turn the main transistor on when the at least one pulse signal is active.

Abstract: A planarization process, the process including performing first sputtering on a material layer, with an area of the material layer which has a relatively low loading condition for sputtering shielded by a first shielding layer, removing the first shielding layer, and performing second sputtering on the material layer to planarize the material layer.

Abstract: A method uses web servers to promulgate information from one server to another, instead of promulgating the information by the user to each server individually. A first server receives a first request for promulgating web-information from a user, locally promulgates the web-information, and sends a second request to at least one second website server to instruct the second website server to locally promulgate the web-information. The selection of the second server is done according to a preset configuration file which includes a relationship mapping between the first website server and the second website server. The relationship mapping may provide the user information related to the second website server based on the user information related to the first website server. The present disclosure further discloses a communication apparatus and a communication system.

Abstract: An array substrate comprises a plurality of pixel units, and each pixel unit comprises a thin film transistor (TFT), a transparent conductive metal layer and a pixel electrode; the TFT includes a gate electrode, an active layer, a source electrode and a drain electrode; the active layer is disposed above or below the gate electrode; the transparent conductive metal layer makes contact with the active layer; and a channel of the active layer is defined by the source electrode and the drain electrode. A display panel and a method for manufacturing the array substrate are also disclosed.

Abstract: In one embodiment, an AC/DC power converter can include: a rectifier bridge and a filter capacitor for converting an external AC voltage to a half-sinusoid DC input voltage; a first storage component, where during each switching cycle in a first operation mode, a first path receives the half-sinusoid DC input voltage to store energy in the first storage component, and a first current through the first storage component increases; a second storage component, where a second path receives a second DC voltage to store energy in the second storage component, and a second current through the second storage component increases; and a third storage component, where in a second operation mode, the first current decreases to release energy from the first to the third storage component, where the second DC voltage includes a voltage across the third storage component through a third path.

Abstract: A source driver circuit can include: (i) a control transistor having a control terminal and first and second power terminals, where the control transistor is coupled between a power terminal of a main switching transistor and ground; (ii) a power supply capacitor coupled between the control terminal of the main switching transistor and ground, where the power supply capacitor is configured to receive a bias voltage that is substantially constant; (iii) a freewheeling diode having a cathode coupled to a control terminal of the main switching transistor, and an anode coupled to the second power terminal of the main switching transistor; and (iv) the control transistor being controllable to be periodically turned on and off to control the main switching transistor to correspondingly follow on and off states of the control transistor.